Is it safe to consume caffeine, sushi and wine while pregnant and if so, how much? Board-certified obstetrician Dr. Jan Rydfors joins Lunch Break with Tanya Rivero. Photo: Getty

This transcript has been automatically generated and may not be 100% accurate.

... and a list of things pregnant women can and cannot be good enough to make anyone's head spin which is the last thing you want if you're also dealing with morning sickness ... so here are the new app to help moms to be sorted all out says Dr E on refers founder of the pregnancy companion app ... by Dr thanks so much for joining us ... we are going to be a time to ... sell ... what are some other things this app ... helps pregnant winning track ... it does get some aam up to date ... aspect of what's happening during the pregnancy though with a baby in themselves ... it helps them track of how much water the drinking ... it has an extensive list of questions and answers over a hundred questions and answers that they can go to ... but tells in which dog to sit to take a pregnancy trucks to wait ... up to what she does everything ... you want to use Sudbury is now looking to fail ... let's start with caffeine what's the consensus here I must confess working as a journalist with crazy schedule although I was pregnant I drank a lot of that ... the ... that's a good one ... this anonymous information about caffeine no the all the studies that show that he might to increase the risk of miscarriages and her neighbor ... but the more means a lot larger studies have shown that ... caffeine Madre she is actually quite say ... I cannot pick up to two on a mini grants and eight which is two cups of coffee for espressos four cups of tea for folks can vary slightly in half and the ... doctor what about ... in just one glass of wine every now and ... the real answer We don't know this know studies have shown that it causes a problem ... um ... so what I tell my patients is half the class the one on special occasions with food ... is probably ... very low grades ... out at ... the doctor they're a lot to say she lovers out there myself included so what's the lowdown on mercury levels in fish and bacteria and say she ... sushi is actually say ... most cases ... it turns out that in the Mecca of all fish test use of force to seize flash frozen sell the bacteria ... all the parasites have been killed off ... the two things you should think about how I for ... one of them is that you should stay away from sushi that contains fish with large amounts Merk receptionist to now ... shark ... swordfish and mackerel ... and finding all the other on fish containing sushi ... to remember that even if they don't have a much firmer Korean them ... you should not have more than two to three servings per